Questions
Imagine two species of snakes that live in a tropical rain forest of Malaysia do not...

Imagine two species of snakes that live in a tropical rain forest of Malaysia do not typically interbreed. In nature, one species is ground-dwelling and feeds mainly on insects and small amphibians near water, whereas the other snake feeds in the lower to mid-canopy of trees and vines rising from the forest floor. However, at a zoo in Singapore where they were kept in the same gallery exhibit, the two species were observed interbreeding and produced viable offspring. Which of the following reproductive barriers is most likely preventing these species from interbreeding in the forest?

  • habitat isolation
  • gametic isolation
  • reduced hybrid viability
  • a postzygotic barrier
  • mechanical isolation

In: Biology

A previous group of students wanted to investigate the factors that contribute to female fecundity (total...

A previous group of students wanted to investigate the factors that contribute to female fecundity (total number of eggs a female lays).  They wondered if the female’s body weight might play a role.  The students collected and weighed 15 newly-emerged virgin female bean beetles.  Each female was mated and given plenty of black-eyed peas on which to lay eggs.  Each day the students checked the beans for eggs, counted the number of eggs, and gave the female fresh beans.  When the female died, the students added up the total number of eggs each female laid.

  1. What is the independent variable?  What are the potential values for this variable? What is the dependent variable?  What are the potential values for this variable?
  2. What are the study subjects?  Be specific!
  3. What might be the researchers’ hypothesis?
  4. What type of scientific study did the researchers conduct?
  5. If this study is an experiment, what are the treatments?  Label the treatments as either experimental or control.
  6. What was the sample size of this study?
  7. List three potentially confounding variables that were or should have been controlled in this study.

In: Biology

How does cyanide poisoning relate to respiration? limit to 1 paragraph

  1. How does cyanide poisoning relate to respiration? limit to 1 paragraph

In: Biology

Codes of ethics and standards for professional nursing practice have been developed by some professional nursing...

  1. Codes of ethics and standards for professional nursing practice have been developed by some professional nursing organizations. These codes and standards guide us in our practice and our interactions with consumers, other nurses, and other health care professions. Select at least one of the ethical standards or one of the standards of practice and tell us how you implement this in your current practice or how you will implement it in your future practice. Which standard is most challenging to you, and why?
  2. Please provide an example of an ethical dilemma you have experienced. How were these issues be addressed/resolved?

IN YOUR OWN WORDS! 100 WORDS FOR EACH QUESTION.

In: Biology

Usain Bolt, a world champion sprinter, can run a 10-meter split in 0.82 seconds. Say you...

Usain Bolt, a world champion sprinter, can run a 10-meter split in 0.82 seconds. Say you obtain a quadriceps muscle sample from Usain Bolt and compare it to one from a 25-year-old male long-distance runner. What differences do you expect to observe between those two muscle samples? Select all that apply.

A) red and white muscle fibers of larger cross-sectional area in Usain Bolt's leg muscles

B) more mitochondria in Usain Bolt's leg muscles

C) more fast-twitch fibers in Usain Bolt's leg muscles

In: Biology

What is the differentiation of the brain?

What is the differentiation of the brain?

In: Biology

Oxygen plays an important role in distinguishing the lifestyles of prokaryotes. Name and describe the five...

  1. Oxygen plays an important role in distinguishing the lifestyles of prokaryotes. Name and describe the five modes of growth bacteria can exhibit in response to oxygen (0.5 pts for each correct lifestyle and description). Provide a bacterial species as an example for each lifestyle and list which clade it belongs to (e.g. Lysinibacillus parviboronicapiens is a Gram-positive bacteria – you won’t get credit if you use this example. 0.5 pts for each correct example and clade).

In: Biology

It may be said that it each week it takes 8000 pounds of grass to feed...

It may be said that it each week it takes 8000 pounds of grass to feed a small herd of zebras (which together weighs 3000 pounds). These zebras will sustain a group of lions, which together weigh 1000 pounds. Why does it take more energy stored in one level of this simple food chain to sustain the next level of the food chain? Your answer lies in the laws of thermodynamics.

In: Biology

Describe two causes of BOTH the fast and the slow phase of EPOC (excess post-exercise oxygen...

Describe two causes of BOTH the fast and the slow phase of EPOC (excess post-exercise oxygen consumption).

In: Biology

Similarities and differences between natural, domestic, and sexual selection.

Similarities and differences between natural, domestic, and sexual selection.

In: Biology

Please answer both questions: 1. A number of different buffers/components are used in the PCR. Explain...

Please answer both questions:

1. A number of different buffers/components are used in the PCR. Explain the function of each:

DNA plasmid


Primer pair


dNTPs mixture


Taq polymerase

2. In our PCR reaction the optimum annealing temperature is 56oC. Explain the general factors that help determine the optimum annealing temperature of a PCR reaction

In: Biology

An organism that possesses all the enzymes of the EMP and Pentose Phosphate pathway has remarkable...

An organism that possesses all the enzymes of the EMP and Pentose Phosphate pathway

has remarkable metabolic flexibility. Consider, for example, the need that organisms have

for erythrose-4-phosphate. Devise a metabolic sequence that will accomplish net synthesis

of erythrose-4-phosphate from glucose without the accumulation of any other

intermediates. (10 points).

In: Biology

How would a variation in fatty acid chain length and saturation affect the fluidity of a...

How would a variation in fatty acid chain length and saturation affect the fluidity of a membrane. Describe how a glycerophospholipid and a sphingolipid would be positioned in this membrane.

In: Biology

A female fruit fly with the recessive mutant phenotype of white eyes and miniature wings is...

A female fruit fly with the recessive mutant phenotype of white eyes and miniature wings is mated with a male possessing the wild-type phenotype of red eyes and normal wings. Among the F1s, all the females are wild-type while all the males exhibit the mutant phenotype. The F2s resulting from a test cross exhibit predominantly (63%) parental phenotypes. How do you explain these results?

In: Biology

1. Please discuss briefly the design and operation of batch heat sterilization of liquids. What factors...

1. Please discuss briefly the design and operation of batch heat sterilization of liquids. What factors affect the sterilization time of the batch system and how does a system achieve a desired level of cell destruction?

2. Is it possible to achieve absolute sterility? Explain.

3. What are the advantages of continuous over batch sterilization of liquids.

4. Explain why for the batch sterilization design is based on the number of microorganism and not on the concentration.

Cite all references.

In: Biology